
Intelligent reflecting surface (IRS) has emerged as a promising technology to enhance the spectral/energy efficiency of future wireless communication systems [1]}, [2]}. Specifically, with a large array of passive reflecting elements, IRS is able to control the radio propagation environment by dynamically tuning the amplitudes and/or phases of incident signals.
Thus, IRS has recently received significant research interests and been investigated in various wireless systems/applications[1]}, [2]}.
